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PCA9633 Datasheet(PDF) 10 Page - NXP Semiconductors |
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PCA9633 Datasheet(HTML) 10 Page - NXP Semiconductors |
10 / 43 page PCA9633_5 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 05 — 25 July 2008 10 of 43 NXP Semiconductors PCA9633 4-bit Fm+ I2C-bus LED driver 7.2 Control register Following the successful acknowledgement of the slave address, LED All Call address or LED Sub Call address, the bus master will send a byte to the PCA9633, which will be stored in the Control register. The lowest 4 bits are used as a pointer to determine which register will be accessed (D[3:0]). The highest 3 bits are used as Auto-Increment flag and Auto-Increment options (AI[2:0]). Bit 4 is unused and must be programmed with zero (0) for proper device operation. When the Auto-Increment flag is set (AI2 = 1), the four low order bits of the Control register are automatically incremented after a read or write. This allows the user to program the registers sequentially. Four different types of Auto-Increment are possible, depending on AI1 and AI0 values. Remark: Other combinations not shown in Table 6 (AI[2:0] = 001, 010, and 011) are reserved and must not be used for proper device operation. AI[2:0] = 000 is used when the same register must be accessed several times during a single I2C-bus communication, for example, changes the brightness of a single LED. Data is overwritten each time the register is accessed during a write operation. AI[2:0] = 100 is used when all the registers must be sequentially accessed, for example, power-up programming. AI[2:0] = 101 is used when the four LED drivers must be individually programmed with different values during the same I2C-bus communication, for example, changing color setting to another color setting. reset state = 80h Remark: The Control register does not apply to the Software Reset I2C-bus address. Fig 10. Control register Table 6. Auto-Increment options AI2 AI1 AI0 Function 0 0 0 no Auto-Increment 1 0 0 Auto-Increment for all registers. D3, D2, D1, D0 roll over to ‘0000’ after the last register (1100) is accessed. 1 0 1 Auto-Increment for individual brightness registers only. D3, D2, D1, D0 roll over to ‘0010’ after the last register (0101) is accessed. 1 1 0 Auto-Increment for global control registers only. D3, D2, D1, D0 roll over to ‘0110’ after the last register (0111) is accessed. 1 1 1 Auto-Increment for individual and global control registers only. D3, D2, D1, D0 roll over to ‘0010’ after the last register (0111) is accessed. 002aab296 AI2 AI1 AI0 0 D3 D2 D1 D0 Auto-Increment flag register address Auto-Increment options |
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